Abstract
Carrier density fluctuations in semiconductor optical amplifiers (SOAs)
impose penalties on phase-shift keying (PSK) signals due to nonlinear phase
noise (NLPN), and on-off keying (OOK) signals due to self-gain modulation.
In this paper, we propose a simple scheme to equalize the impairments
induced by SOA nonlinearities, derived from the small signal analysis of
carrier density fluctuations. We demonstrate via simulation almost complete
cancelation of the NLPN added by a saturated SOA on a differential PSK
signal. We demonstrate via both simulations and experiment the effectiveness
of the method for mitigation of nonlinear distortions imposed by SOAs on an
OOK signal.
© 2010 IEEE
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